AMERICAN SUPERCONDUCTOR CORP /DE/
AMSC · Motors & Generators · 47.7M shares · +2%/yr ↑ shares · EDGAR filings ↗
Reference price $37.63 · est. market cap ~$1.8B — last insider sale, 2026-06-11 (estimated from the dated SEC Form 4 price × shares outstanding — not a live quote)
Grade
B80A profitable grid/wind/naval power-electronics company with top-decile returns and growing scale via acquisitions.
Strengths
- Top-tier returns (ROA 96th pct/18%, ROE 80th pct/24%) with positive FCF and a strong balance sheet (current ratio 2.4, $141M cash)
- Diversified, defensively-tilted demand across grid resiliency, US Navy ship power and industrial/semiconductor markets, expanded by NWL and Comtrafo deals
Risks
- Growth-by-acquisition raises integration risk, and a disclosed material weakness in controls over business-acquisition accounting
- Exposure to wind-market and government-funding cyclicality plus tariff/supply-chain pressures
Notable findings
- Exec changeRecent 8-K item 5.02 8-K ↗
- Material weaknessManagement’s Discussion and Analysis of Financial Condition and Results of Operations” and located elsewhere herein regarding industry prospects, our addressable markets, our competitive position, mac
- Strong balance sheetStrong balance sheet — $141M cash & investments
- Insider sellingInsider selling — 25 open-market sale(s) by 4 insider(s) (cluster of 4 insiders, ~$8M, last 6mo) Form 4 ↗
Quarterly revenue
Last 4 quarters · from SEC filings.
Key metrics
Return on equity
24.1%
Return on assets
18.1%
Revenue growth (QoQ)
-5.0%
Current ratio
2.4×
Free cash flow
$18M
EBITDA
$19M
Tangible book value
$367M
Cash & investments
$141M
Insider transactions · last 18 months
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| 2026-06-11 | Kosiba John W JR | Sell | 5.0K | $37.33 |
| 2026-06-11 | Kosiba John W JR | Sell | 1.7K | $37.85 |
| 2026-06-11 | McGahn Daniel P | Sell | 12K | $37.28 |
| 2026-06-11 | Dambier Laura A. | Sell | 4.0K | $37.63 |
| 2026-06-11 | McGahn Daniel P | Sell | 4.6K | $37.85 |
| 2026-06-08 | Kosiba John W JR | Sell | 3.3K | $41.50 |
| 2026-06-08 | Kosiba John W JR | Sell | 1.5K | $42.35 |
| 2026-06-08 | McGahn Daniel P | Sell | 5.0K | $41.39 |
| 2026-06-08 | McGahn Daniel P | Sell | 4.7K | $42.19 |
| 2026-06-03 | McGahn Daniel P | Sell | 817 | $50.99 |
| 2026-06-03 | Kosiba John W JR | Sell | 3.2K | $48.31 |
| 2026-06-03 | Kosiba John W JR | Sell | 2.6K | $49.28 |
| 2026-06-03 | Kosiba John W JR | Sell | 609 | $50.83 |
| 2026-06-03 | McGahn Daniel P | Sell | 7.1K | $48.31 |
| 2026-06-03 | McGahn Daniel P | Sell | 4.5K | $49.25 |
| 2026-06-03 | McGahn Daniel P | Sell | 500 | $50.29 |
| 2026-06-02 | McGahn Daniel P | Sell | 2.3K | $52.14 |
| 2026-06-02 | Kosiba John W JR | Sell | 600 | $52.19 |
| 2026-06-02 | McGahn Daniel P | Sell | 29K | $51.46 |
| 2026-06-02 | McGahn Daniel P | Sell | 14K | $49.45 |
| 2026-06-02 | McGahn Daniel P | Sell | 28K | $50.63 |
| 2026-06-02 | Kosiba John W JR | Sell | 5.7K | $49.46 |
| 2026-06-02 | Kosiba John W JR | Sell | 12K | $50.62 |
| 2026-06-02 | Kosiba John W JR | Sell | 12K | $51.47 |
| 2026-06-01 | McGahn Daniel P | Grant | 60K | — |
| 2026-06-01 | Kosiba John W JR | Grant | 30K | — |
| 2026-04-03 | Klein Margaret D. | Grant | 3.1K | — |
| 2026-04-03 | Donnelly Terence Robert | Grant | 2.7K | — |
| 2026-04-03 | OLIVER DAVID R JR | Grant | 3.1K | — |
| 2026-04-03 | Littlefield Barbara G. | Grant | 3.1K | — |
| 2026-04-03 | House Arthur H | Grant | 3.1K | — |
| 2026-04-03 | Dambier Laura A. | Grant | 3.1K | — |
| 2026-02-24 | OLIVER DAVID R JR | Sell | 200 | $34.10 |
| 2025-08-08 | House Arthur H | Sell | 9.7K | $50.92 |
| 2025-08-06 | House Arthur H | Option exercise | 9.7K | $6.80 |
| 2025-08-04 | Kosiba John W JR | Sell | 34K | $54.34 |
| 2025-08-04 | Kosiba John W JR | Sell | 9.8K | $55.26 |
| 2025-08-04 | Kosiba John W JR | Sell | 16K | $55.13 |
| 2025-08-04 | McGahn Daniel P | Sell | 73K | $54.26 |
| 2025-08-04 | McGahn Daniel P | Sell | 28K | $55.11 |
| 2025-06-11 | McGahn Daniel P | Sell | 12K | $28.56 |
| 2025-06-11 | McGahn Daniel P | Sell | 500 | $29.09 |
| 2025-06-11 | Kosiba John W JR | Sell | 6.3K | $28.55 |
| 2025-06-11 | Kosiba John W JR | Sell | 300 | $29.08 |
| 2025-06-06 | McGahn Daniel P | Sell | 7.7K | $31.82 |
| 2025-06-06 | Kosiba John W JR | Sell | 4.7K | $31.83 |
| 2025-05-27 | McGahn Daniel P | Sell | 25K | $25.55 |
| 2025-05-27 | McGahn Daniel P | Sell | 98K | $26.60 |
| 2025-05-27 | Kosiba John W JR | Sell | 10K | $25.55 |
| 2025-05-27 | Kosiba John W JR | Sell | 40K | $26.61 |
| 2025-05-20 | Kosiba John W JR | Sell | 12K | $24.50 |
| 2025-05-20 | McGahn Daniel P | Sell | 13K | $24.49 |
| 2025-05-15 | Kosiba John W JR | Grant | 120K | — |
| 2025-05-15 | McGahn Daniel P | Grant | 240K | — |
| 2025-04-03 | OLIVER DAVID R JR | Grant | 2.6K | — |
| 2025-04-03 | Littlefield Barbara G. | Grant | 2.6K | — |
| 2025-04-03 | Klein Margaret D. | Grant | 2.6K | — |
| 2025-04-03 | House Arthur H | Grant | 2.6K | — |
| 2025-04-03 | Dambier Laura A. | Grant | 2.6K | — |
All non-derivative Form 4 activity (SEC), newest first.
Supply chain
Customers (1)
- U.S. Navy
Suppliers (0)
Named in the 10-K; linked when we track them.
Notable events (8-K)
| Date | Items | |
|---|---|---|
| 2026-06-02 | Exec/director changeExhibits | filing ↗ |
| 2026-05-27 | ResultsExhibits | filing ↗ |
| 2026-02-17 | Exhibits | filing ↗ |
| 2026-02-04 | ResultsExhibits | filing ↗ |
| 2025-12-23 | OtherExhibits | filing ↗ |
| 2025-12-10 | Material agreementAcquisition/disposition3.02OtherExhibits | filing ↗ |
| 2025-11-05 | ResultsExhibits | filing ↗ |
| 2025-07-30 | ResultsExhibits | filing ↗ |
Recent filings
| Form | Filed | Period | Accession |
|---|---|---|---|
| 8-K | 2026-06-02 | 2026-06-01 | 0001437749-26-019163 ↗ |
| 10-K | 2026-05-27 | 2026-03-31 | 0001437749-26-018542 ↗ |
| 8-K | 2026-05-27 | 2026-05-27 | 0001437749-26-018539 ↗ |
| 8-K/A | 2026-02-17 | 2025-12-05 | 0001437749-26-004349 ↗ |
| 8-K | 2026-02-04 | 2026-02-04 | 0001437749-26-002977 ↗ |
| 10-Q | 2026-02-04 | 2025-12-31 | 0001437749-26-002978 ↗ |
| 8-K | 2025-12-23 | 2025-12-23 | 0001193125-25-330930 ↗ |
| 8-K | 2025-12-10 | 2025-12-05 | 0001193125-25-314153 ↗ |
| 8-K | 2025-11-05 | 2025-11-05 | 0001437749-25-033344 ↗ |
| 10-Q | 2025-11-05 | 2025-09-30 | 0001437749-25-033351 ↗ |
| 10-Q | 2025-07-30 | 2025-06-30 | 0001437749-25-023968 ↗ |
| 8-K | 2025-07-30 | 2025-07-30 | 0001437749-25-023965 ↗ |